SIM CARDS NOT WORKING

I BOUGHT A (FREELANDER) PD20 7" Screen Android 4.0 MTK6575 Tablet Phone w/ TV/Bluetooth/GPS/Wifi (CPU 1.0GHz/RAM 1GB/HD 8GB) L-132572 I LOVE THIS TABLET BUT, I'M NOT GETTING THE PHONE THE WORK. NO NETWORK. THE BLUETOOTH, WIRELESS WORKS GREAT BUT THE SIM CARDS NOT ACTIVATING. CAN YOU HELP ME please. I CAN GIVE YOU AN IMAGE OF THIS PROBLEM. IS THERE A CODE OR SOFTWARE,I NEED TO GET?